While I could agree that he is or was technically a muslim, and given that he now claims to not be a muslim he is an apostate (which brings up the question of why people would think an apostate would be well received by the islamic world when they are sworn to kill him) I think he views religion as something to be manipulated for personal advantage. Obviously he's not really a Christian, but he did his best to play up his claims during the election.
It’s more than a “technicality”. The call to prayers are the most beautiful sound in the world to him. And he repeats it in most perfect arabic influence.
He repeatedly will not cover his heart. He will “side with the muslims should the winds blow in a bad direction” or some such crap.
Every single day he proves it as he props us our enemies and shivs our allies.
What more proof do we need?